<template>
        <div class="counter-component">   <!--数量组件-->
            <div class="counter-btn" @click="minus"> - </div>
            <div class="counter-show"><input type="text" v-model="number" @keyup="fixNumber"></div>
            <div class="counter-btn" @click="add"> + </div>
        </div>
</template>

<script>
    export default {
         props:{
            max:{
                type: Number,
                default: 5
            },
            min:{
                type :Number,
                default: 1
            }
         },
           data () {
            return {
                number: this.min
            }
           },
           watch:{
             number () {
                this.$emit('on-change', this.number)
             }
           },
           methods:{
            minus () {
                if(this.number <= this.min){
                    return
                }
                this.number--
            },
            add () {
                if(this.number >= this.max){
                    return
                }
                this.number++
            },
            fixNumber () {
                let fix
                if( typeof this.number === 'string'){
                    fix = Number(this.number.replace(/\D/g,''))
                }else{
                    fix = this.number
                }
                if( fix > this.max || fix < this.min){
                    fix = this.min
                }

                this.number = fix
            }

           }
    }
</script>

<style>
.counter-component {
    position: relative;
    display: inline-block;
    overflow: hidden;
    vertical-align: middle;
}
.counter-show {
    float: left;
}

.counter-show input {
    border: none;
    border-top: 1px solid #e3e3e3;
    border-bottom: 1px solid #e3e3e3;
    height: 23px;
    line-height: 23px;
    width: 30px;
    outline: none;
    text-indent: 4px;
}

.counter-btn {
    border: 1px solid #e3e3e3;
    float: left;
    height: 25px;
    width: 25px;
    line-height: 25px;
    text-align: center;
    cursor: pointer;
}

.counter-btn:hover {
    border-color: #4fc08d;
    background: #4fc08d;
    color: #fff;
}

</style>